Carburetor



J. WILLIAMS CARBURETOR Feb. 21, 1950 2 Sheets-Sheet 1 Filed" July 10, 1945 Jizcison WLZZL'QJILS J. WILLIAMS Feb. 21, 1950 CARBURETOR 2 Sheets-Sheet 2 Filed July 10, 1945 Patented Feb. 21, 1950 UNITED STATES PATENT OFFICE CARBURETOR Judson Williams, Philadelphia, Pa.

Application July 10, 1945, Serial No. 604,238

6 Claims.

This invention relates particularly to a carburetor for a portable motor-generator unit of the character wherein a small two-cycle engine is employed to drive a correspondingly small electric generator. I

An object of the invention in this connection is to provide a carbureter embodying a block having a carbureting passage therein, and wherein novel choke and throttle valves will be assembled upon said block in a novel manner to regulate the flow of air and fuel mixture through said passage.

A further object of the invention is to provide a unit wherein the engine crank case will be provided with a removable end plate which carries the carbureter block mentioned, wherein the intake valve will be journaled through the plate upon th block, and wherein by removing said plate, the plate, valve and block may be displaced as a unit.

Other and incidental objects of the invention will appear during the course of the following description, and in the drawings:

Figure 1 is a perspective view of my improved unit.

Figure 2 is an end view of the unit.

' Figure 3 is a vertical section through the carbureter block and associated parts.

Figure 4 is a horizontal section through said block and associated parts including parts of the engine.

of the engine and fan.

Figure 6 is a perspective view of the carbureter 'block and parts associated therewith, the parts being separated but in proper relative position.

Figure '7 is a transverse detail section through the carbureter block at one of the valve sockets therein.

Referring now more particularly to the drawings, I employ an oblong cage 9 which is formed of suitable side, end and bottom bars all rigidly secured together. aluminum to save weight. Y

Mounted within the cage at the top thereof and near one end of the cage is a fuel tank In connected with a float bowl assembly, indicated as a whole at ll, said assembly being located near the opposite end of the cage at the bottom thereof. The assembly II has been made the subject of a separate application filed December 17, 1947, Serial No. 792,175 now Patent No. 2,492,123 issued December 20, 1949.

The assembly I I is mounted upon one end plate of the crankcase of an engine, indicated as a The cage is preferably of whole at l2, and this plate also serves as the end plate of the housing of a fan, indicated as a whole at 13, the fan serving to cool the cylinder of the engine, as will all 'be later explained in detail. Connected with the engine cylinder is an exhaust port assembly, indicated as a whole at N. This assembly forms the subject of Patent No. 2,418,741 issued to me April 8, 1947.

Mounted upon a suitable base plate beneath the tank I is an electric generator l connected with the engine by a belt IS, the base plate being secured to the bottom bars of the cage. The generator may be of any approved character.

It is to be noted that all parts lie within the lines of the cage to be protected thereby, and, preferably, aluminum is used throughout, where possible, so as to gain minimum weight.

As best brought out in Figures 4 and 5 of the drawings, the engine l2 includes a cylindrical crank case ll to which is appropriately attached a cylinder l8 having a liner i9 therein, and removably connected to one end of the crank case is an end plate having a hub 2| fitting in the crank case. The hub 2| mounts a bearing 22 through which is journaled a crank shaft 23 on the inner end of which is fixed a cheek plate 24, and mounted on said plate is a crank pin 25 provided at its ends with like studs one of which is fixed to the cheek plate and the other of which, indicated at 26, is free. Scaling the hub 2| of the end plate 20 is a suitable gland 21.

Reciprocal in the engine cylinder 18 is a piston 28 carrying a connecting rod 29 the large end of which engages the crank pin 25, and closing the cylinder at its upper end is a removable head 30 which carries a protecting cap 3| for the usual spark plug. The cylinder I8, liner l9, and piston 28 are all of aluminum and the assembly has been made the subject of a separate application filed October 2, 1945, Serial No. 619,792.

As best seen in Figures 1 and 2 of the drawings, the end plate 20 of the crank case I! is enlarged and shaped to also provide a removable end plate for a fan housing 32 on which is formed a discharge duct 33, and mating with said duct is a detachable outlet 34 which embraces the engine cylinder l8 at its upper end portion. The outer end wall 35 of the housing is provided centrally with openings 36 to admit air and is also ribbed to provide reinforcement for a socket 31, and fitting in said socket is a bearing 38 for the outer end portion of the crank shaft 23. Fixed to said shaft are blades 39 which, while the engine is in operation, function to impel a blast of air through the duct 33 and outlet 34 about the upper end portion of the engine cylinder l8 for cooling the same. Fixed to the outer end of the crankshaft 23 is a pulley 40 accommodating the belt l6 which drives the generator I and, preferably, said pu'lley is grooved to receive the usual detachable cord which may be wound about the pulley and operated in the customary manner for starting the engine, as willbe well understood.

Detachably connected to the crank case H of the engine opposite the end plate 261s an end plate 4| having a hub 42 which fits in the crank case, and integrally formed on said plate to extend parallel therewith is a carbureter block43 which is provided with a cylindrical valve chamber 44 extending axially of said plate. Closing the valve chamber at its outer end is a press-fit cap 45. Formed through the block is a carbureting passage 46 at the inner end of which is a reduced port 41 entering the valve chamber 44, and rising from the block at its outer end portion is a flat post 48. Connected to the outer end of the block to communicate with the passage 46 is a detachable air filter 49, the details of whichare unimportant.

It is now to be noted that the engine I2 is a two-cycle engine the operation of which will be well understood, and journaled in the valve chamber 44 to control the admission of fuel mixture to the crank case I1 is a hollow intake valve 50 having a port 5| to register with the port 41 of the passage 46. Fixed to the inner openend of said valve .is a cheek plate 52 matching the cheek plate 24 of the crank shaft 23, and formed in the cheek plate 52 is a notch 53 which snugly but removably receives the stud 26 of the crank pin 25. The valve is thus coupled with the crank shaft by a direct, freely separable connection which will serve to rotate the valve in time with the crank shaft while, however, the valve may be withdrawn and removed with the end plate 4| of the crank case and carbureter block 43. Furthermore, it is to be noted that the crank shaft will be wholly supported by the bearings 22 and 38; which bearings will sustain the thrust of the connecting rod 29 on the crank pin 25, so that the valve 50 will turn free of all load on the crank shaft. After the end plate 4| has been removed, the valve may, of course, be readily withdrawn. Thus, a new valve may be readily substituted for a valve which has become worn.

Frictionally fitting in the passage 46 of the carbureter block 43 is a Venturi sleeve 54 located about midway between the ends of said passage, and extending through the block and through said sleeve diametrically of the later is a slidably removable nozzle tube 55 to which is fixed a stop plate 56 abutting the lower side of the block. Detachably connecting the tube with the block is a screw 51 engaged through said plate. The tube is formed at the lee "side thereof with a fuel orifice 58 located axially of the sleeve 54, and

connecting the lower end of said tube with the float bowl assembly H is a flexible hose 59 so that liquid fuel will be supplied to the tube as it is used therefrom.

Screwed over the upper end of the nozzle tube 55 to abut the upper side of the block 43 is a head 60, and screwed through the upper end of said head is a needle valve 6|, the reduced lower end portion of which projects into said tube, the valve being rotatably adjustable to position the tapered lower tip thereof relative to the orifice 58 for regulating the discharge of liquid fuel therefrom. Detachably connected to the upper end of the valve is a knob 62 which is recessed at its lower side to freely receive the. reduced upper end portion of the head, and screwed into the knob is a stop pin 63 which projects at its lower end below the knob to contact the post 48 for limiting the adjustment of the valve in opposite directions. Interposed between the block 43 and the knob is a spring 64 adapted to eliminate any vertical play in the valve, and attached to the post 48 is a detent spring 65, the free end of which bears against the ribbed periphery of the knob for yieldably locking the valve in adjusted position.

As will now be seen, when the port 5| of the intake valve 50 registers with the port 41 at the inner end of the passage 46 of the carbureter block 43, air will be drawn in through the filter 49 and through said passage to flow around the nozzle tube 55 at the area of the orifice 58. Accordingly, as will be well understood, fuel will be drawn through said orifice to mingle with the air supply and form a fuel mixture within the inner end portion of said passage, from whence the mixture will be drawn through the intake valve 50 into the engine crank case. In this connection, it is to be noted that the displacement of the engine is very small, in fact, slightly less the plane of the nozzle tube 55, the carbureter block 43 is recessed at its forward side to provide like sockets 66, one of which is shown in enlarged detail in Figure 7. As will be observed, the sockets are provided with fiat bottom walls which almost touch the periphery of the passage 46 at a tangent thereto to define feathered webs 61, and formed through said webs in a horizontal plane with the axis of the passage are openings 68.

In conjunction with the sockets 66, I provide a pair of like butterfly valves, one of which, indicated as a whole at 69, provides a choke valve, and the other of which, indicated as a whole at 10, provides a throttle valve. These valves include stems 1|, and fixed to the forward ends of said stems are valve disks 12, the peripheries of which project beyond the forward terminals of the stems. Thus, as the valves are assembled upon the block 43, thev disks may, upon being disposed horizontally, be pushed through the feathered webs 61 puncturing the same, when the stems M will enter the openings 68 so that the disks may be disposed within the passage 46. The valve disks will thus form their own slots 13 in said webs, and by mounting the disks on the ends of the stems and feathering the webs, the necessity for milling said slots through the webs is eliminated.

Journaling the valve stems 1| are bushings 14 which freely fit in the sockets 66 of the block 43 and are stepped to provide annularshoulders 15 from which rise nipples 16. Recessed to freely accommodate said nipples are knobs screwed on the outer ends of the stems and, as will be noted, the inner ends of the knobs are partially cut away to provide straight stop shoulders 16 which extend diametrically of the knobs. Preferably, the knob of the choke valve 69 carries a short lever 19-which may be readily grasped for rotating the valve.

Detachably coupling the valves 66 and 16 is a clamping plate 80, the terminals of which are provided with notches 8| which fit the nipples 16 of the bushings 14 so that the ends of the plate abut the shoulders 15, and screwed into the plate are stubs 82, the heads of which are disposed for engagement by the shoulders 18 of the knobs 11 for limiting the rotative adjustment of the valves to open and closed positions. Abutting the plate 80 midway between the stubs is a sleeve 83 provided at its outer end portion with oppositely disposed longitudinal slots 84, and extending through said slots is a bowed detent spring 85, the angled ends of which bear against the ribbed peripheriesof the knobs 11 for yieldably locking the valves in adjusted position. Extending freely through the bottom wall of the sleeve 83 and through the clamping plate 80 is a cap screw 86 which is screwed into the block 43 and rigidly secures all of the assembled parts in position.

As will be appreciated, the sleeve 83 is somewhat larger in diameter than the screw 86 but is centered on the screw by the bottom wall of said sleeve so that the spring 85 may extend over the screw to be supported thereby, and, as will now be seen, tightening of the screw will cause the head thereof to coact with the outer end of the sleeve for binding the ends of the clamping plate 80 against the shoulders 15 of the bushings 14 so that said bushings will be firmly held in the sockets 66 of the block 43 to rigidly support the valves 69 and 10. The construction is simple and provides for the removal of both valves and associated parts simply by removing the single screw 86.

To install the valves 69 and 10, the stems 1| thereof are arranged in parallel relation with the plate 80 therebetween, when the ends of the plate are engaged with the nipples 16 of the bushings 14. The valves are then turned until the disks 12 thereof lie horizontally, when the disks are inserted in the sockets 66 of the block 43. Forward pressure on the valves will then cause the disks to puncture the webs 61, following which the valve stems H will enter the. openings 68 as the disks move into the passage 46, when the plate 80 may be pushed forwardly to seat the bushings 14 in said sockets. The spring 85 is next inserted in the slots 84 of the sleeve 83, when the cap screw 86 in inserted through the sleeve as well as through the plate 88 and screwed into the block 43.

It is believedv that the operation of the carbureter will be readily understood. As will be noted, the valve 69 may be adjusted to regulate the intake of air into the passage 46 of the block 43, while the valve may be adjusted to regulate the flow of fuel mixture into the crank case of the engine.

Having thus described my invention what I claim is:

1. A carbureter including a block having a carbureting passage therein, spaced rotatable butterfly valves mounted upon the block and having stems extending into said passage and provided with valve disks disposed within the passage, knobs carried by said stems, a single means detachably connecting the valves with the block, a sleeve carried by said means and provided with slots, and a detent spring bowed over said means to extend through said slots and yieldably engage said knobs.

2. A carbureter including a block having a carbureting passage therein, spaced butterfly valves having stems extending through a wall removable therefrom, a separate clamping plate extending between the bushings externally of said wall and resting at its ends against said bushings, and means connecting the plate with said block and detachably securing the valves as well as the bushings and plate in position.

3. A carbureter including a block having a carbureting passage therein and provided in a wall of said passage with spaced external sockets, spaced butterfly valves having stems extending into said passage and provided with valve disks disposed within the passage, bushings fitting in said sockets and freely removable therefrom, said bushings journaling the valve stems and being provided with shoulders, a separate clamping plate extending between the bushings externally of said wall and notched at its ends to embrace the bushings resting against said shoulders, and means connecting the plate with said block binding the ends of the plate against said shoulders and detachably securing the valves as well as the bushings and plate in position.

4. A carbureter including a block having a carbureting passage therein, spaced rotatable butterfly valves mounted upon the block and having valve disks disposed within said passage, bushings journaling said valves and freely removable from the block, separate clamping means extending between said bushings externally of the block to rest at its ends against the bushings, and a single connecting means securing said clamping means to the block at a point between the valves binding said clamping means against said bushings and detachably connecting the valves as well as the bushings and clamping means with the block. 7 5. A carbureter including a block having a carbureting passage therein, spaced adjustable butterfly valves mounted upon the block and having stems extending into said passage and provided with valve disks disposed within the passage, adjusting knobs carried by said stems, bushings journaling said stems and freely removable from the block, separate clamping means extending between said bushings externally of the block to rest at its ends against said bushings, a single connecting means securing said clamping means to the block at a point between the valves binding said clamping means against said bushings and detachably connecting the valves as well as the bushings and clamping means with the block, and a single detent spring carried by said connecting means to-yieldably engage at its ends with both knobs for holding the valves in adjusted position.

6. A carbureter including a block having a carbureting passage therein, spaced adjustable butterfly valves having stems extending through a wall of said passage and provided with valve disks disposed within the passage, knobs carried by said stems for adjusting the valves, bushings journaling said stems and abutting said wall but being freely removable from the block, a separate clamping plate extending between said bushings and resting at its ends thereagainst externally of said wall, a single screw securing said plate to the block at a point between the valves binding the plate against said bushings and detachably connecting the valves as well as the bushings and plate with the block, a sleeve carried by said screw and provided with slots, and a detent spring bowed over said screw to'extend through said slots Number yleldably engaging at its ends with both knobs 2,157,074 for holding the valves in adjusted position. 1 2,196,340 JUDSON WILLIAMS. 2,236,595 5 2,246,408 REFERENCES CITED 2 396 517 The following references are of record in the 2,404,833 file of this patent: 2410329 UNITED STATES PATENTS 10 Number Name Date Number 762,577- Cordonnier June 14,1904 180,300, 1,233,503 Peterson July 17, 191': 452,833 1,327,233 Grant 1 Jan. 6, 1920 69,164

1,729,392 Landrum Sept. 24, 1929 16 8 Name Date Erlcson May 2, 1939 Sellgman Apr. 9, 1940 Flsh Apr. 1, 1941 Hammond June 17, 1941 Merchant Mar. 12,1948 Forster July 30, 1946 Miller Oct. 29, 1946 FOREIGN PATENTS Country Date Great Britain July 2, 1923 France Mar. 19, 1913 Sweden Jan. 26, 1926 

